which isn't rocket science. it's just common sense. from td ameritrade. ♪ ♪ >> bob: can't bet that. shortly the president of the united states will be lighting the christmas tree, an annual event. now, it's tradition that the president does this. brings his family down. dana, you and i have both been to one of them. tell us your story. >> dana: the first year i worked in d.c. after the 9/11 attack. christmas season was very special time. obviously, even more so. but it was 71-degrees outside. it was hard to get in the christmas spirit. when the lights went down and the sun went down and the lights came on and the president did lighting of the tree, it was a great moment. i try to go every year even if it was cold. your story is better than mine. >> bob: i was there on the podium there with president carter way back in the back. president carter had a rough year. hostages and a lot going on. he went to push a big button. you did gets or someone to push the button. pushed the button and the tree didn't light up. >> andrea: metaphor. >> bob: took ten seconds. pleasant thing. now, if it